text: Cleveland Potash Limited extracts and refines sylvinite ore from a deposit in North Yorkshire, England. Its processing plant uses froth flotation to produce a product rich in potassium chloride ("KCl"). After a test work campaign in which it compared the performance of the Cell with  mechanical flotation cells in various duties in the flotation circuit, Cleveland Potash ordered a Cell with 6 downcomers for recovering potash slimes. The test work had shown a 4.8% increase in the recovery of potash slimes, equivalent at the time to an increase in revenue of approximately £518,000 per year.